.container {
  background-color: #f2f2f2;
  display: flex;
  .navbar {
    background-color: #1d9894;
    width:200px;
    color:#1a1a1a;
    a{
      display: block;
      padding: 10px;
      color: #fff;
      flex:1;
      text-align: center;
      text-decoration: none;
    }
  }
  .main{
    flex:1;
    padding:20px;
    background-color: red;
    box-sizing: border-box;
  }
}